108120168721 has 4 divisors (see below), whose sum is σ = 108125608500. Its totient is φ = 108114728944.

The previous prime is 108120168713. The next prime is 108120168727. The reversal of 108120168721 is 127861021801.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 68573278225 + 39546890496 = 261865^2 + 198864^2 .

It is a cyclic number.

It is not a de Polignac number, because 108120168721 - 2³ = 108120168713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (108120168727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2689966 + ... + 2729863.

It is an arithmetic number, because the mean of its divisors is an integer number (27031402125).

Almost surely, 2^108120168721 is an apocalyptic number.

It is an amenable number.

108120168721 is a deficient number, since it is larger than the sum of its proper divisors (5439779).

108120168721 is an equidigital number, since it uses as much as digits as its factorization.

108120168721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5439778.

The product of its (nonzero) digits is 10752, while the sum is 37.

The spelling of 108120168721 in words is "one hundred eight billion, one hundred twenty million, one hundred sixty-eight thousand, seven hundred twenty-one".